Setting up a RAID array using UUIDs does not work.

The following mapped-devices block works:

  (mapped-devices
    (list
      (mapped-device
        (source (list "/dev/nvme0n1p2" "/dev/nvme1n1p3"))
        (target "/dev/md0")
        (type raid-device-mapping))))

But this one fails:

  (mapped-devices
    (list
      (mapped-device
        (source (list (uuid "a07c54da-eb61-4135-86b8-8791e863e46a") (uuid "c40026af-ace9-47fc-9d3f-4b8d6a2219cb")))
        (target "/dev/md0")
        (type raid-device-mapping))))

The error message I get is guix system: error: #<<uuid> type: dce bv: #vu8(160 124 84 218 235 97 65 53 134 184 135 145 232 99 228 106)>: invalid G-expression input